<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        function quary(arr){
            let promise= Promise.resolve();
            arr.map(v=>{
                promise=promise.then(()=>{
                    return new Promise(resolve=>{
                        setTimeout(() => {
                            console.log(v);
                            resolve();
                        }, 1000);
                    })
                })
            })
        }

        //依次输出
        quary([1,2,3,4,5,6])
    </script>
</body>
</html>